public class VennExpression extends BinaryExpression
operand0, operand1, operatorEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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VennExpression(Expression p1,
int op,
Expression p2)
Constructor
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| Modifier and Type | Method and Description |
|---|---|
int |
computeCardinality()
Determine the static cardinality of the expression
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int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
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Expression |
copy()
Copy an expression.
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boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value.
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boolean |
equals(Object other)
Is this expression the same as another expression?
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void |
gatherComponents(int operator,
Set set)
Gather the component operands of a union or intersect expression
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the Venn expression
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String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user.
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the items returned by this expression
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int |
getStreamability(int syntacticContext,
boolean allowExtensions,
List<String> reasons)
Get the "sweep" of this expression as defined in the W3C streamability specifications.
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int |
hashCode()
Get a hashCode for comparing two expressions.
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SequenceIterator |
iterate(XPathContext c)
Iterate over the value of the expression.
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Iterator<SubExpressionInfo> |
iterateSubExpressionInfo()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
|
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
|
Expression |
promote(PromotionOffer offer,
Expression parent)
Promote this expression if possible
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Expression |
simplify(ExpressionVisitor visitor)
Simplify the expression
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Pattern |
toPattern(Configuration config,
boolean is30)
Convert this expression to an equivalent XSLT pattern
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Pattern |
toStreamingPattern(Configuration config,
List<String> reasonForFailure)
Convert this expression to a streaming pattern (a pattern used internally to match nodes during
push processing of an event stream)
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Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression
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displayOperator, explain, explainExtraAttributes, getArguments, getOperands, getOperator, isAssociative, isCommutative, isInverse, iterateSubExpressions, replaceSubExpression, setFlattened, toStringaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setLocationId, staticTypeCheck, suppressValidation, typeErrorpublic VennExpression(Expression p1, int op, Expression p2)
p1 - the left-hand operandop - the operator (union, intersection, or difference)p2 - the right-hand operandpublic String getExpressionName()
getExpressionName in class Expressionpublic final ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cachepublic final int computeCardinality()
computeCardinality in class BinaryExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic int computeSpecialProperties()
computeSpecialProperties in class BinaryExpressionStaticProperty.NON_CREATIVE. This is overridden
for some subclasses.public void gatherComponents(int operator,
Set set)
operator - union or intersectset - the set into which the components are to be gathered. If the operator
is union, this follows the tree gathering all operands of union expressions. Ditto,
mutatis mutandis, for intersect expressions.public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify in class BinaryExpressionvisitor - an expression visitorXPathException - if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck in class BinaryExpressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class BinaryExpressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Expression promote(PromotionOffer offer, Expression parent) throws XPathException
promote in class BinaryExpressionoffer - details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expressionparent - the containing expression in the expression treeXPathException - if any error is detectedpublic Expression copy()
copy in class Expressionpublic Iterator<SubExpressionInfo> iterateSubExpressionInfo()
iterateSubExpressionInfo in class BinaryExpressionpublic boolean equals(Object other)
equals in class BinaryExpressionpublic int hashCode()
BinaryExpressionhashCode in class BinaryExpressionpublic Pattern toPattern(Configuration config, boolean is30) throws XPathException
toPattern in class Expressionconfig - the Saxon configurationis30 - true if this is XSLT 3.0XPathException - if conversion is not possiblepublic Pattern toStreamingPattern(Configuration config, List<String> reasonForFailure)
toStreamingPattern in class Expressionconfig - the Saxon configurationreasonForFailure - a list which will be populated with messages giving reasons why the
expression cannot be convertedpublic SequenceIterator iterate(XPathContext c) throws XPathException
iterate in class Expressionc - The context for evaluationXPathException - if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic int getStreamability(int syntacticContext,
boolean allowExtensions,
List<String> reasons)
getStreamability in class ExpressionsyntacticContext - one of the values Expression.NAVIGATION_CONTEXT,
Expression.NODE_VALUE_CONTEXT, Expression.INHERITED_CONTEXT, Expression.INSPECTION_CONTEXTallowExtensions - if false, the definition of "guaranteed streamability" in the
W3C specification is used. If true, Saxon extensions are permitted, which make somereasons - the caller may supply a list, in which case the implementation may add to this
list a message explaining why the construct is not streamable, suitable for inclusion in an
error message.Expression.W3C_MOTIONLESS, Expression.W3C_CONSUMING,
Expression.W3C_GROUP_CONSUMING, Expression.W3C_FREE_RANGINGpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.